CentOS7虚拟机优化

CentOS7：

1. 将网卡配置重点关注的地方为：

   [root@master ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33
   BOOTPROTO=static
   # UUID=ca1110e0-295f-4ca2-80ef-fc6b0ee6d4cd
   ONBOOT=yes
   IPADDR=192.168.225.151
   NETMASK=255.255.255.0
   GATEWAY=192.168.225.2
   DNS1=223.5.5.5
   DNS2=223.6.6.6
   

2. yum源配置,阿里云的yum源（Base和epel）

   mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
   
   # Base源
   CentOS 6
   wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
   或者
   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
   
   CentOS 7
   wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
   或者
   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
   
   # epel源（如有配置其他epel源，则需要备份）
   mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
   
   mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup
   
   wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
   
   # 最后
   yum clean all	# 清除缓存
   yum makecache	# 生成缓存
   yum repolist  # 验证是否成功
   

3. 下载常用的软件：

   yum -y install bash-completion lrzsz sysstat net-tools tree wget vim -y
   

4. 修改selinux和firewalld服务

   # selinux的位置: /etc/selinux/config
   sed -i s/SELINUX=enforcing/SELINUX=disabled/g /etc/selinux/config
   setenforce 0	# 临时关闭
   getenforce 		# 查看状态
   
   # 关闭防火墙
   systemctl  status firewalld
   systemctl  stop firewalld
   systemctl  disable firewalld
   systemctl  status firewalld